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Ionic radii are:
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The correct answer is:
inversely proportional to effective nuclear charge
Ionic radius in the $n^{\text {th }}$ orbit is given by
$$
r_n=\frac{n^2 a_0}{\mathrm{Z}} \text { or, } r_n \propto \frac{1}{\mathrm{Z}}
$$
Related Theory
The radius of the ion depends on the effective nuclear charge, more the charge, more heavily the electrons are attracted towards the centre and lesser in the size.
$$
r_n=\frac{n^2 a_0}{\mathrm{Z}} \text { or, } r_n \propto \frac{1}{\mathrm{Z}}
$$
Related Theory
The radius of the ion depends on the effective nuclear charge, more the charge, more heavily the electrons are attracted towards the centre and lesser in the size.
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